Alternating-current motor



A. P. MYER 1,750,240

ALTERNATNG CURRENT MOTOR March 11, 1930.

- Filed March 14, 1927 Patented Mar. 11, 1930 UNITED STATES PATENT- OFFICE ALBERT P. MYER, l' MINNEAPOLIS, MINNESOTA, ASSIGNOR TO SIMPLEX HEAT REGU- LATOR COIPANY, 0l` MINNEAPOLIS,

MINNESOTA, A. CORPORATION OF MINNESOTA ALTEBNATING-CUBBENT MOTOR Application tiled latch 14, 1927. Serial No. 175,192.

This invention relates to a motor and while the invention could have various applications, it articularly relates to a small motor of the in uction type. The motor may be used in various places, ut one use in practice `has been in connection with a thermostat regu-` lator for furnaces, the motor being used to operate the furnace controls or dampers. Such a motor shouldv befsim lein construc- 1o' tion, inexpensive and be one t at will readily start fromyrest when current is applied.

It is an object of this invention, therefore, to provide a simple and icient construction of induction-motor having the rotor in two l5 laterally spaced parts,` the field frame and coil for said rotor being connected.

It is a further object of the invention to provide a simple and eiiicient construction of a rotor for a motor.

It is also an object of the invention to provide an induction motor having one field coil, a divided iield frame, spaced rotors, the coils or `bars ofthe rotors being respectively circumferentially staggered.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings, in which like reference characters refer to similar parts 30 throughout the several views and in which Fig. 1 is a view in side elevation of the motor;

Fi 2 is a vertical section taken on line 2--2 of Fig. 1 as indicated by the arrows;

Fig. 3 is a view in side elevation of the rotor removed from the machine;

Fig. 4 is a partial sectional view of the rotor such as shown in Fig. 2, the same being shown on an enlarged scale;

Fig. 5 is a vertical section taken on line 5-5 of Fig. 4, as indicated by the arrows; and

Fig. 6 is a vertical section taken on line 6-6 of Fig. 1 as indicated by the arrows.

Referring to the drawings, a motor is 45 shown comprising a frame having side plates 10 which are spaced and said plates are connected and held in relative rigid position by the tie rods 11 receiving the clamping bolts 12. The field frame 13 of the motor is dis posed between the frame pieces 10, said field frame being made up of quite a large number of thin plates struction as indicated in Fig. 2 and 6. The field frame 13 is divided at its upper portion by the slots 13L and has semi-cylindrical portions 13b forming a substantiallyv cylindrical recess or chamber in which the rotor 14 is disposed, said upper portions at each side of said rotor forming the pole pieces. The field frame 13 is also provided with recesses 13c and shading rings 15 are provided passing through said recesses and around one side of said field frame. It will be seen in Fig. 2 that the field frame comprises two portions 13d being held in properly spaced rela-V tion by the spacing members 16 on the rods 11. The lower portion of the field frame has a recess 13 therein forming a lower straight portion 13t on the frame. The portion 13t is not divided into the portion 13d but is formed oi` one body of laminated plates. The coil 17 is wound about the portion 13t of the field so as to be of laminated conframe,'said coil being disposed between end plates 18 of insulating material and having the terminals 17 a leading therefrom.

The armature 14 is also divided into two laterally spaced parts 14a which are respectively alined with the porticns'13d of the field frame. Each section 14a comprises side plates 14",.between which are a plurality of thin ironor` steel plates 14 separated by insulating plates 14d. The plates 14", 14c and 141 are rovided with a plurality of circumferen-- tial y spaced slots in their peripheries, in which are disposed the insulating members 14 extending about the walls of said slots in plates 14 and 14d and bars 14t of copper, brass or other good conducting metal are disosed within the insulating members 14e, said bars extending to and being electrically I connected to the side plates 14". Asshown in Fig. 3, the bars .14 on one section 14 are disposed opposite the spaces between the bars onthe other section 14". The latter sections M148 are mounted upon a bushing of insulating material 19, held on the shaft by any suitable means such as the set screw 21 and said shaft 20 is journaled in bosses 10 on the side frame plates 10. The shaft 20 will carry a w suitable belt or gearing for operating the devices which are to be actuated from the motor.

Cover plates 22 'are provided, seated u on the top of the field frame 13 and exten ing across the to of the slots 13.

w In operation alternatingcurrent will be supplied to the conductors and to the coil 17, the rotors comprising the side plates 14" and the cross bars 14 constituting a squirrel cage construction and the rotor is thus refixed sections substantially `alined with the sections of s'aid field frame, and spaced the same distance therefrom, said sections each having side plates with bars set in the ed thereof and extending therebetween formin a squirrel cage structure, and a laminate body between said plates, said bars in one 20 volved in the ordinary manner of an induction motor. The motor is simple and etiicient in construction and well adapted for use as a thermostatically operated motor for controlling a furnace. The spaced field portions 25 13l andy the spaced rotor sections 14* give good ventilation so that the motor is not un-A s duly heated. The bars 14t being staggered in the two sections 14, cause the rotor to revolve with a more uniform rotation.

From the above description it is seen that plicant has rovided'a very simpleand cient form o small induction motor. The

parts are few and the device is easily made and assembled. The same has been demonstrated in actual very successful an elicient.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scopeof consists in a device capable of carrying out the objects above set forth, in the novel arts and combinations of parts disclosed an dened in the appended claims. What is claimed isa- 1. Analternating current motor comprisin a frame member having a lower portion, a eld coil on said portion, said frame bein being connected at their lower portion, a field coil wound about saidv connected lower portion, a rotor disposed between sa-id pole pieces divided above said coil into laterally space ractice and found tovbe applicants invention, which, generally stated,

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u and comprising laterally spaced relatively 

